Polishing compound



Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE OTHO V. STEWART, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORI'ORATION OF PENNSYLVANIA POLISHING COMPOUND No Drawing. Application filed December My invention relates to a composition of matter, and especially to a compound for pol-.

ishing and varnishing extremely hard materials.

It is one of the objects of my invention to provide a polishing compound containing a material that shall remove imperfections in the surfaces of extremely hard materials and I which has properties that render it valuable that prevents the abrasive from rapidly cutting the smoothed surface of the material after the imperfections are removed.

I have discovered an improved polishing compound that is suitable or polishing the surfaces of extremely hard materials, particularly the surface of chromium metal. When compound is utilizedin a hand-polishing operation, or on a centrifugal buifer wheel, the material operates to cut away small raised portions and imperfections in the 'surface of the metal, but it does not possess sufficient cutting power'to continue rapid abradin of a relatively smooth surface.

y improved pkolishing com ound is a mixture of green c romic oxide Cr O and stearine wax, mixed in the proportions of about two parts oxide to about 1 part stearine wax. The chromic oxide is prepared by reducing it to a fine powder containing particles insuflicient in size to produce visible scratches in the-polished surface. The oxide may be reduced to such degree of fineness by grinding, or by any of the other well-known metho s. 1

The oxide and the stearine wax are mixed in the above-noted proportions asfollows: The wax is heated to 90 to 100 C. and the chromic oxide is slowly stirred into the wax in such manner that a smooth paste results. The mixture may then be poured into molds to cool. 1

I may vary the properties of the mixture 8, 1925. Serial m. 74,192.

by adding a small amount of a light hydrocarbon oil, such as kerosene. The light oil provides a softening effect on the compound according to the amount used and it provides a polishingcompound having slightly better lubricating properties than the wax-oxide composition. I may use an amount of kerosene equal to .1 to 10% of the weight of the wax. A preferred composition is made by adding about 1% kerosene oil to the mixture of oxide and wax.

Although I have described a preferred composition and a modification thereof, I may utilize a light lubricating oil instead of kerosene, or I may still further modify the compound by substituting another wax-like lubricant provided the lubricantretains the oxide in suspension and preserves an even distribution of oxide throughout the finished compound. Other modifications of my invention will suggest themselves to those skilled in the artwithout departing from the spirit of my invention, as defined in the annexed claims. A

I claim as my invention:

'1. A composition of matter which consists of finely divided green chromic oxide intimately mixed with stearine wax.

2. A composition of matter which consists of finely divided green chromic oxide intimately mixed with a vehicle having lubricatiniproperties. o

3. composition of'matter which consists of finely divided green chromic oxide intimately mixed with a vehicle having lubricating properties and being capable of retaining a constant distribution of said oxide throughout said vehicle.

4. A composition of matter which consists of finely divided green chromic oxide intimately mixed with stearine wax in the proportions of about 1 part stearine wax to 2 parts oxide. 7

5. A composition of matter which consists of finely divided green chromic oxide intimately. mixed with a vehicle having lubricating properties and a small amount of a light hydrocarbon oil.

- 4 6. A composition of matter which consists of finely divided green chromic oxide int-ilnately mixed with a Vehicle having lubrieating properties and a small amount of kerosene oil.

In testimony whereof, I have hereunto subscribed my name this first day of December, 1925.

OTHO v. STEWART. 

